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Purchased Loans - Loan Portfolio by Risk-rating Grades (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 9,083,129	$ 7,620,322
Commercial, financial, agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,295,912	1,039,393
Real estate – construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	740,668	633,389
Real estate – 1-4 family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,795,343	2,343,721
Real estate – commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,051,509	3,427,530
Installment loans to individuals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	199,697	176,289
Purchased
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,693,417	2,031,766
Purchased | Internal Noninvestment Grade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,852,090	1,284,431
Purchased | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,746,683	1,241,834
Purchased | Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	84,250	24,595
Purchased | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	21,157	18,002
Purchased | Commercial, financial, agricultural | Internal Noninvestment Grade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	369,748	248,993
Purchased | Commercial, financial, agricultural | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	333,147	241,195
Purchased | Commercial, financial, agricultural | Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	33,857	4,974
Purchased | Commercial, financial, agricultural | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,744	2,824
Purchased | Real estate – construction | Internal Noninvestment Grade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	101,964	81,220
Purchased | Real estate – construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	101,122	81,220
Purchased | Real estate – construction | Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Purchased | Real estate – construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	842	0
Purchased | Real estate – 1-4 family mortgage | Internal Noninvestment Grade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	128,806	100,039
Purchased | Real estate – 1-4 family mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	113,874	91,369
Purchased | Real estate – 1-4 family mortgage | Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	7,347	2,498
Purchased | Real estate – 1-4 family mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	7,585	6,172
Purchased | Real estate – commercial mortgage | Internal Noninvestment Grade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,251,570	853,498
Purchased | Real estate – commercial mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,198,540	827,372
Purchased | Real estate – commercial mortgage | Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	43,046	17,123
Purchased | Real estate – commercial mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,984	9,003
Purchased | Installment loans to individuals | Internal Noninvestment Grade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2	681
Purchased | Installment loans to individuals | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	678
Purchased | Installment loans to individuals | Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Purchased | Installment loans to individuals | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 2	$ 3

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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-Paragraph 4
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